content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  
  
  import java.util.concurrent.Callable;
  
  import org.junit.Test;
  
  import io.reactivex.observable.Single;
  
  public class SingleFromCallableTest {
      @Test
      public void fromCallableValue() {
          Single.fromCallable(new Callable<Integer>() {
              @Override public Integer call() throws Exception {
                  return 5;
              }
          })
              .test()
              .assertResult(5);
      }
  
      @Test
      public void fromCallableError() {
          Single.fromCallable(new Callable<Integer>() {
              @Override public Integer call() throws Exception {
                  throw new UnsupportedOperationException();
              }
          })
              .test()
              .assertFailure(UnsupportedOperationException.class);
      }
  
      @Test
      public void fromCallableNull() {
          Single.fromCallable(new Callable<Integer>() {
              @Override public Integer call() throws Exception {
                  return null;
              }
          })
              .test()
              .assertFailureAndMessage(NullPointerException.class, "The callable returned a null value");
      }
  }
  